Dear Wolfram Sang, > On Tue, Jul 02, 2013 at 01:01:00PM -0300, Fabio Estevam wrote: > > According to mx23 erratum 2727: > > > > "2727 : I2C 9th Clock Pulse (ACK) not generated when RETAIN_CLOCK set. > > > > Description: > > > > When RETAIN_CLOCK is set, the ninth clock pulse (ACK) is not generated. > > However, the SDA line is read at the proper timing interval. If > > RETAIN_CLOCK is cleared, the ninth clock pulse is generated. > > Also, the HW_I2C_VERSION register incorrectly states the version is 1.2. > > It should be 1.3. > > > > Workaround: > > HW_I2C_CTRL1[ACK_MODE] has default value of 0. It should be set to 1 to > > enable the fix for this issue." > > > > It has also been noticed that mx28 needs to implement this fix in order > > to have SMBus to work properly. > > > > Reported-by: Christoph Baumann <cb@xxxxxxx> > > Signed-off-by: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx> > > What's with this one? Bogus? Needed? Still needed after PIO rework? I dont think this is needed on MX28 as this is set by default. On MX23, I dont see any difference with this enabled/disabled. Best regards, Marek Vasut -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
